To pull an "Uncle Bernie" is to leave your wife/girlfriend/significant other in the middle of the night....no notice...no note....no nothing.....checkmate

My Uncle Bernie was watching the lateshow one night in the 1960's and his wife asked him if he was coming up stairs to go to bed.....his last words to her were: "I will be up right after the late show" No one saw or heard from him again for three and a half years.

A white person who sucks up to minorities to show how "woke" and moral he is.
Origins: Stemming from the word Uncle Tom and Bernie Sanders' speech of "when you're white you don't know what it's like to be poor speech".

SJW: I prefer to acknowledge my white privilege and pay reparations to the blacks for slavery.
Normal Person: You are such an Uncle Bernie, you know that?